/Engine/Source/Runtime/Engine/Classes/Kismet/KismetInternationalizationLibrary.h
Returns the current language if the group category doesn't have a culture override.
The culture as an IETF language tag (eg, "zh-Hans-CN").
static [FString](API\Runtime\Core\Containers\FString) GetCurrentAssetGroupCulture ( const [FName](API\Runtime\Core\UObject\FName) AssetGroup )